Estimate the size of these angles then add your estimates together.
Teacher: There's a protractor you can drag over the angles to measure them. Hold down the shift key while dragging to rotate the protractor. The previous Flash version of this activity is here. This may be useful if you have an older web browser that does not support rotating the protractor.
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Casio Classwiz Calculator
There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).
As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!
This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...